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ACCOUNTS RECEIVABLE (Tables)
 12 Months Ended
Oct. 28, 2023
Receivables [Abstract]  
Schedule of Activity in Allowance for Doubtful Accounts The following table summarizes the activity in Ciena’s allowance for credit losses for the fiscal years indicated (in thousands):
Year EndedBeginning BalanceEffect of adoption of new accounting standardProvisionsNet DeductionsEnding Balance
October 30, 2021
$10,598 $2,206 $2,346 $4,238 $10,912 
October 29, 2022(1)
$10,912 $— $4,199 $4,153 $10,958 
October 28, 2023
$10,958 $— $5,718 $5,022 $11,654 

(1) On March 7, 2022, Ciena announced its decision to suspend its business operations in Russia immediately. As a result, Ciena’s allowance for doubtful accounts includes a provision for a significant asset impairment of $1.8 million for a trade receivable related to this decision.